Sound control system for steel roof decks

Abstract

A steel roof deck diaphragm to provide structural rigidity to a building wherein loads of varying intensity can cause movement of structural members, which tends to generate noise when two members rub or work against each other. Corrugated sheets of high tensile steel are supported from below and span the distance between purlins, the corrugated sheets having over-lapping side edges and end edges and upper and lower surfaces. Non-metallic strips of felt form spacers positioned between the over-lapping side edges and end edges to prevent generation of noise resulting from relative movement of the corrugated sheets.

Description

A steel roof deck diaphragm having non-metallic spacers between over-lapping side edges and end edges of steel sheets to prevent noise resulting from relative movement of the sheets and resilient cushions between the steel sheets and supporting purlins.BACKGROUND OF INVENTIONRoof deck systems, composed of a high tensile steel base with thermal insulation and high performance mineral board mechanically anchored to the steel sections, provide composite strength. The resultant assembly is a strong, durable substrate for roofing applications. Composite roof deck assemblies are disclosed in U.S. Pat. No. 4,601,151; U.S. Pat. No. 4,736,561; U.S. Pat. No. 4,707,961; U.S. Pat. No. 4,783,942 and U.S. Pat. No.: 5,584,153.Corrugated steel sections are positioned over structural supports and anchored in place with welded connections through special weld washers, of the type disclosed in U.S. Pat. No. 4,601,151, or with mechanical fasteners. Thermal insulation, available in a variety of types an...

AI Technical Summary

Benefits of technology

We have found that by isolating the steel deck sections from contact with all steel surfaces, the noise created by deck movement could be eliminated. We placed sound deadening material such as a heavy felt, between the supporting structure and the steel sheets, so that the steel roof d...

Problems solved by technology

As the insulation thickness increases the length of the threaded fasteners increases, creating potential rotation and bending problems for the fasteners.

As a result, the thickness of the insulation is limited by the threaded fastener length.

Additionally, since fasteners typically extend all the way through the roofing layers from the exterior of the roof to the interior supporting structure of the roof, thermal shorts may be created between the exterior of the roof and the interior of the roof, which is undesirable in extremely hot or cold climates.

Thermal expansion and contraction of the steel sheets and the steel purlins can cause movement of adjacent surfaces, which generates noise when the surfaces rub or work against each other.

Expansion and contraction creates noise at the juncture between edges and ends of the sheets and between the lower surface of the sheets and upper surfaces of the purlins which support them.

However, when the insulated ceiling is eliminated, unwanted...

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